The Hair Growth Cycle

Hair Loss Reasons for Men

The Hair Growth Cycle

Hair Loss Reasons for Women

Reason for Hair Turn Into Grey

Repigmentation = Melanin

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Reason for Hair Turn Into Grey

HAIR SCIENCE

Hair Structure Consists Of:

Hair Follicle:

Hairfollicle: small cavity made up of keratinocytes and melanocytes that extend in dermis.

From this organ, the hair root develops with a progressive accumulation of keratinocytes continuously dividing in the hair matrix of the bulb.

Melanocytes located in the bulb produce melanin and transfer it to the surrounding keratinocytes. It will provide the constitutive hair color.

Hair Shaft: 

Hairshaft: visible part above skin consist of an accumulation of keratinized pigmented keratinocytes of hair follicle (cells gradually lose their nucleus and become filled with keratin, a hard protein). The melanin is in the cortex.

Pigmentation starts in the bulb
at the same time as hair grows

Melanin

Why Hair Varies From Blonde to Black?

Hari shaft
Transverse section of hair shaft
  • The natural color of hair is due to the presence of melanin all along the shaft in the middle layer (cortex)
  • Color shade depends on the variable amounts and distribution of 2 types of melanin (genetically programmed): eumelanin (black-brown pigments) vs. pheomelanin (red-yellow pigments)

Remember this:

natural pigments maintain natural hair colour

Hair Follicle

A small cavity made of keratinocytes and melanocytes that extends into the dermis tissue. From here, the hair root develops with a progressive accumulation of keratinocytes that continues to divide in the matrix of the hair follicle located at the bulb area. Melanocytes located in the bulb area then produce melanin pigment, which is transferred to neighbouring keratinocytes, to provide the constitutive hair colour.

Hair Shaft

The visible part above the skin layer. It consists of an accumulated amount of keratinised pigmented keratinocytes of hair follicles (cell gradually lose their nucleus and become filled with keratin, a hard protein), with melanin in its cortex. Pigmentation starts from the bulb area and continues to expand as the hair grows.

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